User blog comment:AngryAggron/Generation VII Pokémon/@comment-31800919-20170430170631

Hmm how about for alolan form pokemon a separate islands for them like in Fire red the Sevii Islands, if you bring a pikachu and use the thunder stone you get Alolan raichu only there, same with exeggutor. This method is like how to evolve Magneton to Magnezone and Nosepass to Probopass you need to be in a specific location to get their evolve form.